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Title: Diaphragm Meter Capacity Ratings At Elevated Pressures
Author: Howard Holmes
Source: 1976 International School of Hydrocarbon Measurement
Year Published: 1976
Abstract: Through the y e a r s , the gas i n d u s t r y has been s t e a d i l y improving, e s p e c i a l l y f r om a t e c h n o l o g ical and product i m p r o v e m e n t s viewpoint. Today, the as i n d u s t r y has s t a n d a r d i z e d on most a p p l i c a t i o n s , methods and definitions as compared t o the knowledge possessed just twenty short y e a r s ago. Within the m e a s u r e m e n t field, two i m p o r t a n t a r e a s a r e still open for d i s c u s s i on and at t h e d i s c r e t i o n of t h e individual p e r s o n s or companies o p e r a t i n g within t h e s e a r e a s . One is the lack of an i n d u s t r y s t a n d a r d definition for a s t a n d a r d cubic foot of n a t u r a l g a s and second i s the lack of an i n d u s t r y s t a n d a r d for d i a p h r a gm m e t e r capacity r a t i n g s at elevated p r e s s u r e s . T h e r e a r e p r e s e n t l y in u s e a m i n i m um of t en different base p r e s s u r e s , each of which defines a s t a n d a r d cubic foot of n a t u r a l g a s . There a re many different methods of gas m e a s u r e m e n t in use today - the t h r e e most common a r e d i a p h r a gm d i s p l a c e m e n t m e t e r s , r o t a r y d i s p l a c e m e n t m e t e r s, and i n f e r e n t i a l m e t e r s.

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